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P1157 Buick Code - HO2S Bank 2 Sensor 2 Lean System Or Low Voltage

Quick Answer

The P1157 Buick code indicates an issue with the HO2S (Heated Oxygen Sensor) Bank 2 Sensor 2 on the vehicle. Common causes include Faulty HO2S Bank 2 Sensor 2, Wiring or connector issues, Vacuum leaks. Severity is High - diagnose this code as soon as possible. Driving is not recommended if the warning light is flashing, the engine runs poorly, or safety-related symptoms are present.

What it means
P1157 Buick indicates HO2S Bank 2 Sensor 2 Lean System Or Low Voltage.
Common causes
Common causes include Faulty HO2S Bank 2 Sensor 2, Wiring or connector issues, Vacuum leaks.
Severity
High - diagnose this code as soon as possible.
Can I drive?
Driving is not recommended if the warning light is flashing, the engine runs poorly, or safety-related symptoms are present.
What is this?
Table of contents Created and updated by William Orellana on Sep 10, 2024
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Code P1157 Buick Description

The P1157 Buick code indicates an issue with the HO2S (Heated Oxygen Sensor) Bank 2 Sensor 2 on the vehicle. This sensor is responsible for monitoring the oxygen levels in the exhaust gases and sending this data to the engine control module (ECM) for proper air-fuel ratio adjustments. When the sensor detects that the air-fuel mixture is too lean or there is low voltage reading, it triggers the P1157 code.

OBDII Code P1157 Buick - HO2S Bank 2 Sensor 2 Lean System Or Low Voltage
P1157 Buick Code - HO2S Bank 2 Sensor 2 Lean System Or Low Voltage

Common Causes of P1157 Buick

  1. Faulty HO2S Bank 2 Sensor 2
  2. Wiring or connector issues
  3. Vacuum leaks
  4. Fuel pressure problems
  5. Internal engine issue affecting air-fuel mixture

Symptoms of P1157 Buick

  1. Decreased fuel efficiency
  2. Engine misfires
  3. Rough idling
  4. Hesitation during acceleration
  5. Stalling

How to Fix P1157 Buick

  1. Diagnose the issue using an OBD-II scanner to confirm the P1157 code.
  2. Inspect the HO2S Bank 2 Sensor 2 and its wiring for any damage or corrosion.
  3. Test the sensor's voltage output using a multimeter to determine if it is functioning correctly.
  4. Replace the HO2S Bank 2 Sensor 2 if it is found to be faulty, ensuring proper installation and connection.
  5. Clear the error code from the ECM's memory and perform a test drive to verify that the issue has been resolved.

Cost to Fix P1157 Buick

The typical repair costs for addressing a P1157 Buick code can range from $150 to $300, including the cost of the oxygen sensor itself and labor charges. However, it is important to note that the specific diagnosis time and labor rates at auto repair shops can vary based on factors such as location, vehicle make and model, and engine type. It is advisable to check local rates for a more accurate estimate before proceeding with the repair.

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About the author: William Orellana is a Master Mechanic and Mechanical Engineer with over 30 years of experience diagnosing and repairing vehicles. Learn more about his background.

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